54AC240 •54ACT240
Octal Buffer/Line Driver with TRI-STATE®Outputs
General Description
The ’AC/’ACT240 is an octal buffer and line driver designed
to be employed as a memory address driver, clock driver and
bus oriented transmitter or receiver which provides improved
PC board density.
Features
nI
CC
and I
OZ
reduced by 50%
nInverting TRI-STATE outputs drive bus lines or buffer
memory address registers
nOutputs source/sink 24 mA
n’ACT240 has TTL-compatible inputs
nStandard Microcircuit Drawing (SMD)
—’AC240: 5962-87550
—’ACT240: 5962-87759
Logic Symbol
Pin Names Description
OE
1
,OE
2
TRI-STATE Output Enable Inputs
I
0
–I
7
Inputs
O
0
–O
7
Outputs
Connection Diagrams
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
FACT®is a registered trademark of Fairchild Semiconductor Corporation.
IEEE/IEC
DS100280-1
Pin Assignment
for DIP and Flatpak
DS100280-2
Pin Assignment
for LCC
DS100280-3
August 1998
54AC240
•
54ACT240 Octal Buffer/Line Driver with TRI-STATE Outputs
© 1998 National Semiconductor Corporation DS100280 www.national.com
Truth Tables
Inputs Outputs
OE
1
I
n
(Pins 12, 14, 16, 18)
LL H
LH L
HX Z
Inputs Outputs
OE
2
I
n
(Pins 3, 5, 7, 9)
LL H
LH L
HX Z
H
=
HIGH Voltage Level
L=LOW Voltage Level
X=Immaterial
Z=High Impedance
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=−0.5V −20 mA
V
I
=V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to V
CC
+ 0.5V
DC Output Diode Current (I
OK
)
V
O
=−0.5V −20 mA
V
O
=V
CC
+ 0.5V +20 mA
DC Output Voltage (V
O
) −0.5V to V
CC
+ 0.5V
DC Output Source
or Sink Current (I
O
)±50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)±50 mA
Storage Temperature (T
STG
) −65˚C to +150˚C
Junction Temperature (T
J
)
CDIP 175˚C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC 2.0V to 6.0V
’ACT 4.5V to 5.5V
Input Voltage (V
I
) 0VtoV
CC
Output Voltage (V
O
) 0VtoV
CC
Operating Temperature (T
A
)
54AC/ACT −55˚C to +125˚C
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
V
IN
from 30%to 70%of V
CC
V
CC
@3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@4.5V, 5.5V 125 mV/ns
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom-
mend operation of FACT®circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
54AC
Symbol Parameter V
CC
T
A
=Units Conditions
(V) −55˚C to +125˚C
Guaranteed Limits
V
IH
Minimum High Level 3.0 2.1 V
OUT
=0.1V
Input Voltage 4.5 3.15 V or V
CC
− 0.1V
5.5 3.85
V
IL
Maximum Low Level 3.0 0.9 V
OUT
=0.1V
Input Voltage 4.5 1.35 V or V
CC
− 0.1V
5.5 1.65
V
OH
Minimum High Level 3.0 2.9 I
OUT
=−50 µA
Output Voltage 4.5 4.4 V
5.5 5.4 (Note 2)
V
IN
=V
IL
or V
IH
3.0 2.4 I
OH
=−12 mA
4.5 3.7 V I
OH
=−24 mA
5.5 4.7 I
OH
=−24 mA
V
OL
Maximum Low Level 3.0 0.1 I
OUT
=50 µA
Output Voltage 4.5 0.1 V
5.5 0.1 (Note 2)
V
IN
=V
IL
or V
IH
3.0 0.50 I
OL
=12 mA
4.5 0.50 V I
OL
=24 mA
5.5 0.50 I
OL
=24 mA
I
IN
Maximum Input 5.5 ±1.0 µA V
I
=V
CC
, GND
Leakage Current
3 www.national.com
DC Characteristics for ’AC Family Devices (Continued)
54AC
Symbol Parameter V
CC
T
A
=Units Conditions
(V) −55˚C to +125˚C
Guaranteed Limits
I
OZ
Maximum TRI-STATE V
I
(OE) =V
IL
,V
IH
Leakage Current 5.5 ±5.0 µA V
I
=V
CC
, GND
V
O
=V
CC
, GND
I
OLD
Minimum Dynamic 5.5 50 mA V
OLD
=1.65V Max
I
OHD
Output Current (Note 3) 5.5 −50 mA V
OHD
=3.85V Min
I
CC
Maximum Quiescent 5.5 80.0 µA V
IN
=V
CC
Supply Current or GND
Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
Note 4: IIN and ICC @3.0V are guaranteed to be less than or equal to the respective limit @5.5V VCC.
ICC for 54AC @25˚C is identical to 74AC @25˚C.
DC Characteristics for ’ACT Family Devices
54ACT
Symbol Parameter V
CC
T
A
=Units Conditions
(V) −55˚C to +125˚C
Guaranteed Limits
V
IH
Minimum High Level 4.5 2.0 V V
OUT
=0.1V
Input Voltage 5.5 2.0 or V
CC
− 0.1V
V
IL
Maximum Low Level 4.5 0.8 V V
OUT
=0.1V
Input Voltage 5.5 0.8 or V
CC
− 0.1V
V
OH
Minimum High Level 4.5 4.4 V I
OUT
=−50 µA
Output Voltage 5.5 5.4 (Note 5)
V
IN
=V
IL
or V
IH
4.5 3.70 V I
OH
=−24 mA
5.5 4.70 I
OH
=−24 mA
V
OL
Maximum Low Level 4.5 0.1 V I
OUT
=50 µA
Output Voltage 5.5 0.1 (Note 5)
V
IN
=V
IL
or V
IH
4.5 0.50 V I
OL
=24 mA
5.5 0.50 I
OL
=24 mA
I
IN
Maximum Input 5.5 ±1.0 µA V
I
=V
CC
, GND
Leakage Current
I
OZ
Maximum TRI-STATE 5.5 ±5.0 µA V
I
=V
IL
,V
IH
Leakage Current V
O
=V
CC
, GND
I
CCT
Maximum 5.5 1.6 mA V
I
=V
CC
− 2.1V
I
CC
/Input
I
OLD
Minimum Dynamic 5.5 50 mA V
OLD
=1.65V Max
I
OHD
Output Current (Note 6) 5.5 −50 mA V
OHD
=3.85V Min
I
CC
Maximum Quiescent 5.5 80.0 µA V
IN
=V
CC
Supply Current or GND
Note 5: All outputs loaded; thresholds on input associated with output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
Note 7: ICC for 54ACT @25˚C is identical to 74ACT @25˚C.
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AC Electrical Characteristics
54AC
V
CC
T
A
=−55˚C
Symbol Parameter (V) to +125˚C Units
(Note 8) C
L
=50 pF
Min Max
t
PLH
Propagation Delay 3.3 1.0 11.0 ns
Data to Output 5.0 1.0 8.5
t
PHL
Propagation Delay 3.3 1.0 10.5 ns
Data to Output 5.0 1.0 8.0
t
PZH
Output Enable Time 3.3 1.0 11.5 ns
5.0 1.0 9.0
t
PZL
Output Enable Time 3.3 1.0 13.0 ns
5.0 1.0 10.5
t
PHZ
Output Disable Time 3.3 1.0 12.5 ns
5.0 1.0 10.5
t
PLZ
Output Disable Time 3.3 1.0 13.5 ns
5.0 1.0 11.0
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
AC Electrical Characteristics
54ACT
V
CC
T
A
=−55˚C
Symbol Parameter (V) to +125˚C Units
(Note 9) C
L
=50 pF
Min Max
t
PLH
Propagation Delay 5.0 1.0 9.5 ns
Data to Output
t
PHL
Propagation Delay 5.0 1.0 9.0 ns
Data to Output
t
PZH
Output Enable Time 5.0 1.0 10.0 ns
t
PZL
Output Enable Time 5.0 1.0 11.5 ns
t
PHZ
Output Disable Time 5.0 1.0 11.0 ns
t
PLZ
Output Disable Time 5.0 1.0 11.5 ns
Note 9: Voltage Range 5.0 is 5.0V ±0.5V
Capacitance
Symbol Parameter Typ Units Conditions
C
IN
Input Capacitance 4.5 pF V
CC
=OPEN
C
PD
Power Dissipation 45.0 pF V
CC
=5.0V
Capacitance
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6
Physical Dimensions inches (millimeters) unless otherwise noted
20 Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
20 Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
7 www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys-
tems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and whose fail-
ure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
National Semiconductor
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www.national.com
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Tel: 81-3-5620-6175
Fax: 81-3-5620-6179
20 Lead Ceramic Flatpak (F)
NS Package Number W20A
54AC240
•
54ACT240 Octal Buffer/Line Driver with TRI-STATE Outputs
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
